Tracking moving points on a reconstructed plane
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When you have a point that you have tracked in the Movie Clip Editor, you generally use it to solve camera motion. Occasionally, like in a VFX scenario, one might deploy a style called Two-point Motion Tracking. This uses two tracked points, reconstructed as empties that will move on an X/Y Plane. In the linked video, the narrator goes on to show that if you have a dowel rod with sharpie at the top and bottom (points for tracking), and you track those points, you can stretch a glowing cylinder between them and make it look like the person is wielding a lightsaber.

Your Scenario

In your case, you will probably be looking at a type of One-point Motion Tracking, except with multiple one points for each scenario.


You will want to be happy with your camera track. After tracking the animals, re-solving the camera motion will be a pain to not possible.
Track an animal.
Go to Bottom toolbar > Reconstruction menu > Link Empty to Track. There should now be a Plain Axes Empty connected to the Camera by a dotted blue line.
In the 3D Viewport, switch to Local Transform Orientation.
Move the Empty as close or as far away from the camera as needed (probably along Local Z).
Parent your animal (I assume) to the Empty.


Hope this helps and happy Blending!